Decanting device



Dec. 23, 1952 A. D. WAY

DECANTING DEVICE Filed Nov. 13, 1950 ARNOLD D. WAY

JNVENTOR.

Patented Dec. 23, 1 952 'T QFFI-CE ration of Delaware Aiiia'li'catidnNaveiiiber 13, 1950, Serial No. 195,442

7 claims.

This invention rela to}, decanting device for decanting liquid from; atank at Qa coiitrolled rate; all as more fully described and as claimedhereinafter. I 1 e v e Existing decaiiting devices 'sjiec'ially thoseused in feeding chemical sqm mns' for suspensions for treatment of waterand other liquids are not wholly sansgiamlery. r e v H r u The objectsof this invention are to nrovide an improved decanting d1 efof siniple'con struction in which the b 'isageslthrough which the liquid flows a eim mi. #9 bec me d ge and which is adaptabl a tanl; having a relativelyhigh height-d ratio, r e

Themahner in time these a i other objects are achieved is shown in theaiip'nded drawings inwhich: M.

Fig. 1 is an elevation, partner section; along lines 17-"! of Figs} 2and of a decanting device according to my invention; 1 r v Fig. 2 is aplan v ewer hie device of Fig. 1; Fig. 3 is a plan view, fiartly ifisection, along lines of Fig. 1; and Figs. 4 and 5' are Iagr'a ticillustrations of modifications of the device wn in Figs; I; 2 and3. e a

In the several views like numerals refer to like parts.

Referring now to digs, l to 3; a decanting device according to my meal nshown in a tank l0 havingafi outlet I I' figQ -o' thesid e s2 adjacenta; the; et'tomg a di t t ng e. The tank lllis' prpv'iqe'aw n a a 15 weighas a trap door lfiffalt I b provided with a ha le t8 to p'ermit accessto the interiorof the; tank "tho'ut having to remove the cover 15. Theover t is openings l9 and 2B the burii'o's 6f which will be describedlater.

Attached to the outlet pipe l l withinjthe tank H! is a draw off systemcomprising aswing joint 22 which by mem r 'aliilipie 23 is connected toa swing joint 24 which. in turn, is connected by a pipe 25 to a draw-offhead 26 provided with an overfiow weirs 21.

On to Of the coveijlfi mounted; a rnotor 3%) which has a shaft 3l diingja gearjrjeducer 32. On the slow s it; 3 of the gear reducer 32 arema te s :all drum Stand 1arge drum ssca r "a k3}. the cov er IE: isfurthermore in unte de means in the form of fan ldle'r' drum 1 uppbfte'dinj abr'aclcet 38'. Aflat tensiofi'l'n" r' orttanelfl'istastened to thedraw'eoff head 4'1 and also fastened to and wound p bathe large amines,passing vertically up through th opening l-9. Another tension membereitape-tzj is' fastened; to the swing joint 24 at 43; asseeuiri fellthe'oigenjng 2c, Dyer idler or v 31 i hastened to andwound- 15 on thesnail d-fiifii' 34'.

v .In operation the tank In is filled to the level 46 with the liquid 45to; be decanted. At this time the parts occupy the positions shown insolid lines in Fig. 1. fIfhe niotor 3B is now op erated and rotatesshaft 33 withdrums and a counter-clockwise direction as viewed inFig. 1. This unwinds theta-hes 4 B and 42 and lowers the draw-off head26 and swing joint 24, the latter being lowered at aslower rate of's'peedbecause of the smaller diameter of drum 34. ;As the draw-off head26 drops the liquid 45 is being decanted over weir zl and out throughpipes 25; 23 and u. The dotted lines indicate the position when thelevel has drop'ped to the line indicated at 41 and the tank In is nearlyempty. To refill the tank the cranktii is turned in a clockwisedirection thereby "winding tape 49 on drum 35 and tape -42 on drum 34and restoring the parts to the position shown insolid lines, Thereuponthe tank It may be refilled with liquid through trap door lfi V 'lfhetapes 4!] and 4 2 are advantageously made of high tensilestrengthstainless steelapproximately one-half to one inch wide and 0.004inch thick. Su'ch tape has ample strength to support the draw-off systemfor tanks up to ten feet in diameter yet is not subject to' corrosion bymost liquids that may be decanted and does not appreciably change theefiective diameters o f drums 34 and 35' when the tapes 42 andrespectively, are wound up on such drums in several I layers. With thisarrangement the draw-off head 26 is' being lowered in what is for allpractical purposes a straight vertical line and the rate at which suchhead is being lowered is practically constant provided the speed ofrotation of motor 3|] is constant.

In Figs. 1 to 3 the distance from swing joint 22 toswing joint 24 equalsthe distance from the swing joint 24 to th'e fastening ill on drawor:head 26 and the diameter of drum 34 half the diameter of drum; 35.; Suchdimensioning, however, may be modified as indicated in Fight If A is thedistance from swin joint 22 to swing joint 2'4, B the distance fromswing joint ii to fastening ill, D1 the diameter of drum 34 and D2 thediameter oi drum 35 as indicated in Fig. 4 the" following relationshipshould be maintained to obtain straight line and uniform lowering} ofthe draw-err head 26:

Q} A D A+B m the foregoing; e uatida if A eaters B then Dzequals '2D1which is the arrangement shown Fig. 5 shows a modification in which adrum 50 is rotatably attached to the swing joint 24 and the tape, afterpassing over idler drum 31, is passed around drum 50 and then fastenedto a fixed support 5|. In this modification the length A must equal thelength B and the drums 34 and 35 are made of equal diameter as indicatedat 52. With this arrangement the swing joint 24 will be lowered atone-half the rateof speed at which draw-off head is being lowered.

A decanting device according to my invention is distinguished by therelative simplicity of the mechanical parts submerged in the liquid tobe decanted. At the same time the liquid flowing through pipes 25, 23and H encounters a steady pitch towards the outlet which is particularlyimportant to prevent clogging when the liquid is a suspension as, forinstance, milk of lime. When decanting is desired at a uniform rate, themotor is operated continuously at constant speed. When decanting isdesired at a variable rate, the motor 30 is controlled to operate atvariable speed or intermittently as is well-known to those skilled inthe art.

While I have shown and described what I consider the best embodiment ofmy invention, modifications other than those shown herein may be madewithout departing from the spirit of my invention and reference is,therefore, made to the following claims for a definition of the scope ofmy invention.

What I claim is:

1. A decanting device having a tank for liquid to be decanted, an outletpipe near the bottom of said tank, a draw-ofi system comprising a swingjoint attached to said outlet pipe within said tank, a second swingjoint, a pipe leading from said first named swing joint to said secondswing joint, a draw-off head, and a pipe leading from said second swingjoint to said draw-off head, and means for lowering said draw-off systemcomprising support means located vertically above said draw-off head,other support means located above said second swing joint, a motor, aspeed reducer operated by said motor and having a slow moving shaftmounted on one of said support means, drum means on said shaft, guidemeans mounted on the other of said support means, a tape wound up onsaid drum means and extending to said draw-off head, and another tapewound up on said drum means and extending to said second swing joint,one of said tapes passing over said guide means, said draw-off systemand said means for lowering said drawoff system being so constructed andarranged that said pipe leading from said first named swing joint tosaid second swing joint and said pipe leading from said second swingjoint to said draw-01f head have a steady pitch from said draw-off headto said first named swing joint.

2. A decanting device having a tank for liquid to be decanted, an outletpipe near the bottom of said tank, a draw-off system comprising a swingjoint attached to said outlet pipe within said tank, a second swingjoint, a pipe leading from said first named swing joint to said secondswing joint, a draw-off head, and a pipe leading from said second swingjoint to said draw-off head, and means for lowering said draw-offsystern comprising support means located vertically above said draw-01fhead, other support means located above said second swing joint, amotor, a speed reducer operated by said motor and having a slow movingshaft mounted on one of said support means, two drums on said shaft,guide means mounted on the other of said support means, a tape wound upon one of said drums and extending to said draw-off head, and anothertape wound up on the other of said drums and extending to said secondswing joint, one of said tapes passing over said guide means, saiddrawoff system and said means for lowering said drawoff system being s0constructed and arranged that said pipe leading from said first namedswing joint to said second swing joint and said pipe leading from saidsecond swing joint to said drawoff head have a steady pitch from saiddraw-off head to said first named swing joint.

3. A decanting device having a tank for liquid to be decanted, an outletpipe near the bottom of said tank, a draw-01f system comprising a swingjoint attached to said outlet pipe within said tank, a second swingjoint, a pipe leading from said first named swing joint to said secondswing joint, a draw-off head, and a pipe leading from said second swingjoint to said draw-off head, and means for lowering said draw-off systemcomprising a motor, a speed reducer operated by said motor and having aslow moving'shaft, two drums on said shaft, a tape wound up on one ofsaid drums and extending to said draw-off head, and another tape woundup on the other of said drums and extending to said second swing joint,the ratio of the diameter of said other drum to the diameter of said onedrum being equal to the ratio of the distance between said first namedswing joint and said second swing joint to the sum of said distance plusthe distance between said second swing joint and said draw-oft head.

4. A decanting device having a tank for liquid to be decanted, an outletpipe near the bottom of said tank, a draw-off system comprising a swingjoint attached to said outlet pipe within said tank, a second swingjoint, a pipe leading from said first named swing joint to said secondswing joint, a draw-off head, and a pipe leading from said second swingjoint to said draw-off head, the distance between said first named swingjoint and said second swing joint being equal to the distance betweensaid second swing joint and said draw-off head, and means .for loweringsaid draw-off system comprising a motor, a speed reducer operated bysaid motor and having a slow moving shaft, two drums on said shaft, atape wound up on one of said drums and extending to said draw-off head,and another tape wound up on the other of said drums and extending tosaid second swing joint, the diameter of said other drum being equal tohalf the diameter of said one drum.

5. A decanting device having a tank for liquid to be decanted, an outletpipe near the bottom of said tank, a draw-off system comprising a swingjoint attached to said outlet pipe within said tank, a second swingjoint, a pipe leading from said first named swing joint to said secondswing joint, a draw-off head, and a pipe leading from said second swingjoint to said draw-off head, and means for lowering said draw-off systemcomprising a motor, a speed reducer operated by said motor and having aslow moving shaft located vertically abovesaid draw-off head, two drumson said shaft, a tape wound up on one of said drums and extending tosaid draw-off head, an idler drum located above said second swing joint,and another tape wound up on the other of said drums and extending oversaid idler drum to said second swing joint, said draw-off system andsaid means for lowering said draw-off system being so constructed andarranged that said pipe leading from said first named swing joint tosaid second swing joint and said pipe leading from said second swingjoint to said draw-off head have a steady pitch from said draw-off headto said first named swing joint.

6. A decanting device having a, tank for liquid to be decanted, anoutlet pipe near the bottom of said tank, a draw-off system comprising aswing joint attached to said outlet pipe within said tank, a secondswing joint, a, pipe leading from said first named swing joint to saidsecond swing joint, a draw-off head, and a pipe leading from said secondswing joint to said draw-oil head, the distance from said first namedswing joint to said second named swing joint being equal to the distancefrom said second named swing joint to said draw-off head, and means forlowering said draw-off head at a predetermined rate of speed and saidsecond swing joint at half said rate of speed comprising a motor, aspeed reducer operated by said motor and having a slow moving shaft,drum means on said shaft, a tape wound up on said drum means andextending to said draw-01f head, and another tape wound up on said drummeans and extending to said second swing joint, said draw-oil system andsaid means for lowering said draw-01f ARNOLD D. WAY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 385,969 Tardy July 10, 1888552,513 Carman Jan. 7, 1896 769,972 Wiles Sept. 13, 1904 1,427,650Spangler Aug. 29, 1922 1,437,685 Scharpenberg et a1. Dec. 5, 19221,774,943 Patterson Sept. 2, 1930 2,021,247 Waugh Nov. 19, 19352,365,298 Sebald et al Dec. 19, 1944

